class_docstr: A device function for single elementwise operations.
      
code: def emit_call_code(self):
      params = self.in_params + self.out_params
      return "{op_name}({params});".format(
          op_name=self.name,
          params=", ".join([var.lvar_name for var in params]),
      )
  
imports: import string
  import numpy
  from cupy._core import _codeblock
  from cupy._core._fusion_variable import _TraceVariable
  from cupy._core._fusion_variable import _TraceArray
  from cupy._core._fusion_variable import _VariableSet
  from cupy._core import _fusion_thread_local
  from cupy._core import _kernel
  from cupy._core import _reduction
  from cupy._core._scalar import get_typename
label_desc: Use image node_id 3 for calling the _UfuncRoutine obj's underlying member method code with example usage: obj.emit_call_code() and returns: str